[turbofan] ARM64: Tweak code gen for cmp with sxtw

[turbofan] ARM64: Tweak code gen for cmp with sxtw

For 64-bit cmp, replace the if clause with InputOperand2_64(), and apply the
same change to cmn.

BUG=

Committed: https://crrev.com/ceb0afbef633a99f007865584570fcb1d4f77b84
Cr-Commit-Position: refs/heads/master@{#37855}

[martyn.capewell, 2016-07-18 15:42:24]

martyn.capewell@arm.com changed reviewers:
+ bmeurer@chromium.org, epertoso@chromium.org, jarin@chromium.org

[Benedikt Meurer, 2016-07-19 04:08:04]

LGTM, thanks.

[martyn.capewell, 2016-07-19 08:44:20]

The CQ bit was checked by martyn.capewell@arm.com

[commit-bot: I haz the power, 2016-07-19 08:44:26]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-19 09:35:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-19 09:35:21]

Description was changed from

==========
[turbofan] ARM64: Tweak code gen for cmp with sxtw

For 64-bit cmp, replace the if clause with InputOperand2_64(), and apply the
same change to cmn.

BUG=
==========

to

==========
[turbofan] ARM64: Tweak code gen for cmp with sxtw

For 64-bit cmp, replace the if clause with InputOperand2_64(), and apply the
same change to cmn.

BUG=

Committed: https://crrev.com/ceb0afbef633a99f007865584570fcb1d4f77b84
Cr-Commit-Position: refs/heads/master@{#37855}
==========

[commit-bot: I haz the power, 2016-07-19 09:35:22]

Patchset 1 (id:??) landed as
https://crrev.com/ceb0afbef633a99f007865584570fcb1d4f77b84
Cr-Commit-Position: refs/heads/master@{#37855}